Which of these is true? Statement I: Every pair of distinct prime numbers is co-prime. Statement II: 1 and any other number are always co-prime.
- A.Only I is true
- B.Only II is true
- C.Both I and II are true ✓
- D.Neither I nor II is true
Explanation: Two different primes can never share a common factor besides 1, so I is true. And the only factor of 1 is 1 itself, so I is always co-prime with anything — II is also true.
Class 6 IMO Mathematics Olympiad practice · Number Sense · Factors, Multiples & Primes
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